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st: RE: re: purging a dataset
From
"Martin Weiss" <[email protected]>
To
<[email protected]>
Subject
st: RE: re: purging a dataset
Date
Sun, 28 Mar 2010 23:09:43 +0200
<>
Kit`s approach could be telescoped to
*******
sysuse auto, clear
reg trunk rep78
preserve
drop if !e(sample)
pwcorr price trunk
restore
*******
since you condition only once on being a member of the estimation sample,
and then work on the subset thus created, until you ulimately -restore-...
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Kit Baum
Sent: Sonntag, 28. März 2010 23:06
To: [email protected]
Subject: st: re: purging a dataset
<>
To follow up on Philippe's suggestion
sysuse auto, clear
reg trunk rep78
gen sample=e(sample)
pwcorr price trunk if sample
You can use the qualifier 'if sample' on each command to restrict it to use
the regression sample. Another approach is to do
sysuse auto, clear
reg trunk rep78
gen sample=e(sample)
preserve
drop if !sample
pwcorr price trunk
...
...
restore
all commands given after the 'drop if !sample' will be performed only on the
estimation sample. Any variables created between 'preserve' and 'restore'
will be dropped when you restore. Sometimes it is useful to work
(temporarily) with this subset dataset.
Kit Baum | Boston College Economics & DIW Berlin |
http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming |
http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata |
http://www.stata-press.com/books/imeus.html
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